I've obtained roller coaster and 350 pF TX capacitor.

"Rick Karlquist N6RK" wrote in message
news:Nb2Xc.42797$9d6.33881@attbi_s54...
"Airy R. Bean" wrote in message
...
What do I do, however, for those frequencies for which it is close
to a half wave? PI network? Or L network?

An L network with reactances of several hundred ohms for
both inductor and capacitor.

Rick N6RK